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Adsorber heat exchanger using Al-fumarate beads for heat-pump applications – a transport study
Faraday Discussions ( IF 3.3 ) Pub Date : 2020-04-10 , DOI: 10.1039/d0fd00009d David Farrusseng 1, 2, 3, 4, 5 , Cécile Daniel 1, 2, 3, 4, 5 , Conor Hamill 6, 7, 8 , Jose Casaban 6, 7, 8 , Terje Didriksen 9, 10, 11 , Richard Blom 9, 10, 11 , Andreas Velte 12, 13, 14 , Gerrit Fueldner 12, 13, 14 , Paul Gantenbein 15, 16, 17 , Patrick Persdorf 15, 16, 17 , Xavier Daguenet-Frick 15, 16, 17 , Francis Meunier 10, 11, 18
Faraday Discussions ( IF 3.3 ) Pub Date : 2020-04-10 , DOI: 10.1039/d0fd00009d David Farrusseng 1, 2, 3, 4, 5 , Cécile Daniel 1, 2, 3, 4, 5 , Conor Hamill 6, 7, 8 , Jose Casaban 6, 7, 8 , Terje Didriksen 9, 10, 11 , Richard Blom 9, 10, 11 , Andreas Velte 12, 13, 14 , Gerrit Fueldner 12, 13, 14 , Paul Gantenbein 15, 16, 17 , Patrick Persdorf 15, 16, 17 , Xavier Daguenet-Frick 15, 16, 17 , Francis Meunier 10, 11, 18
Affiliation
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Metal–Organic Frameworks (MOFs), thanks to their type V water adsorption isotherms (“S-Shape”) and large water capacities, are considered as potential breakthrough adsorbents for heat-pump applications. In particular, Al(OH)-fumarate could enable efficient regeneration at a lower temperature than silica-gel which would allow us to address the conversion of waste heat at low temperature such as found in data centers. Despite its greater adsorption capacity features, heat and mass transport limitations could jeopardize the potential performance of Al(OH)-fumarate. Heat and mass transport depend on the size of the bodies (mm range), their packing and on the pore structures, i.e. macro–mesopore volumes and sizes. This paper describes the cost-efficient and scalable synthesis and shaping processes of Al(OH)-fumarate beads of various sizes appropriate for use in water Adsorption Heat-Pumps (AHPs). The objective was to study transport limitations (i.e. mass and heat) in practical e beads which meet mechanical stability requirements. Dynamic data at the grain scale was obtained by the Large Temperature Jump method while dynamic data at the adsorber scale was obtained on a heat exchanger filled with more than 1 kg of Al(OH)-fumarate beads. Whereas the binder content had little impact on mass and heat transfer in this study, we found that Knudsen diffusion in mesopores of the grain may be the main limiting factor at the grain scale. At the adsorber scale, heat-transfer within the bed packing as well as to the heat exchanger is likely responsible for the slow adsorption and desorption kinetics which have been observed for very low desorption temperature. Finally, the dynamic aspects of the observed water adsorption isotherm shift with temperature are discussed in light of reported reversible structure modification upon temperature triggered water adsorption–desorption.
中文翻译：
使用富马酸铝珠进行热泵应用的Adsorber热交换器–运输研究
金属有机骨架（MOF）由于具有V型吸水等温线（“ S形”）和较大的水容量，被认为是热泵应用中潜在的突破性吸附剂。特别地，富马酸铝（OH）可以在比硅胶更低的温度下实现高效再生，这将使我们能够解决诸如在数据中心发现的低温下废热的转化。尽管它具有更大的吸附能力，但热量和物质传输的限制可能会危害富马酸铝（OH）的潜在性能。传热和传质取决于物体的尺寸（毫米范围），其堆积和孔结构，即宏观-中孔的体积和大小。本文介绍了适用于水吸附热泵（AHP）的各种尺寸的富马酸Al（OH）-富马酸酯珠的经济高效且可扩展的合成和成型工艺。目的是研究运输限制（即质量和热量）在符合机械稳定性要求的实用e珠中。晶粒度的动态数据是通过大温度跳跃法获得的，而吸附剂级的动态数据是在装有1千克以上富马酸Al（OH）富马酸盐珠的热交换器上获得的。尽管这项研究中的粘合剂含量对传质和传热几乎没有影响，但我们发现克努森在晶粒中孔中的扩散可能是晶粒尺寸的主要限制因素。在吸附器规模上，床填料内部以及至热交换器的热传递可能是缓慢的吸附和解吸动力学的原因，这对于非常低的解吸温度已经观察到。最后，
更新日期：2020-04-10
中文翻译：
使用富马酸铝珠进行热泵应用的Adsorber热交换器–运输研究
金属有机骨架（MOF）由于具有V型吸水等温线（“ S形”）和较大的水容量，被认为是热泵应用中潜在的突破性吸附剂。特别地，富马酸铝（OH）可以在比硅胶更低的温度下实现高效再生，这将使我们能够解决诸如在数据中心发现的低温下废热的转化。尽管它具有更大的吸附能力，但热量和物质传输的限制可能会危害富马酸铝（OH）的潜在性能。传热和传质取决于物体的尺寸（毫米范围），其堆积和孔结构，即宏观-中孔的体积和大小。本文介绍了适用于水吸附热泵（AHP）的各种尺寸的富马酸Al（OH）-富马酸酯珠的经济高效且可扩展的合成和成型工艺。目的是研究运输限制（即质量和热量）在符合机械稳定性要求的实用e珠中。晶粒度的动态数据是通过大温度跳跃法获得的，而吸附剂级的动态数据是在装有1千克以上富马酸Al（OH）富马酸盐珠的热交换器上获得的。尽管这项研究中的粘合剂含量对传质和传热几乎没有影响，但我们发现克努森在晶粒中孔中的扩散可能是晶粒尺寸的主要限制因素。在吸附器规模上，床填料内部以及至热交换器的热传递可能是缓慢的吸附和解吸动力学的原因，这对于非常低的解吸温度已经观察到。最后，
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